T&M project vs Income

How can i manage the cost on a T&M project ?

I create projects, tasks, with affected users, those users declare their effort.

I want to declare all thoses efforts/ cost to my customer.

I want to make a snaphoot at the end of the week (sumup all costs/effort) in a order/bill to my customer.

How can i do that in efficient way ?

Thx for your help/

This feature is available, great

let me decompose for my understanding :

I create a new Activities Type name "Selling Task"
I create a project with type set to "Time & Materials"
I create an activity on previous project with "Selling task" activity type
I declare real work allocation on the task (3 days with a cost of 300€ for ressource pierre), visible in the activity and in the project.
I declare an activity price on previous project with activity "selling task", price 50€.
I create a bill and enter 1 line per ressource for the period and activtity.

I excepted to have 300€ instead of 150€

Thx



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Understood your answer and the way it is done

I have now to develop a way to automatically create all bill lines.

Entering manually the Sell cost of each profile may result in typing error and is not very effective => not acceptable for my business.

For my specific usage, I have to publish the bill weeky.